We were privileged to be able to walk the track, along with a knowledgeable guide. This difficult-to-arrange experience is not yet available to visitors - but in the future, maybe?
At the Postal Museum's Mail Rail, 15-20 Phoenix Place, London WC1X ODA.
Uploaded to Flickr by Ian-S on 4 September 2017
Photo © Ian-S, 4 September 2017. Licensed for reuse under this Creative Commons licence